X-ray spectroscopy (PDF) - SRON

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Examples of He-like triplets (picture courtesy Frits Paerels) Collisional ionisation Photoionisation See Porquet 2011 67 68 Example: O VII (Porquet et al. 2001) Density diagnostics triplets (Porquet et al. 2011) 69 70 Dependence on UV radiation field • Forbidden & intercombination upper level coupled also by radiation field • Strong UV field altered ratio; can mimic high density! • Example: star ζ Ori, T=30000 K (fig. from Raassen et al. 2008) Triplet in NEI plasma • Ionising plasma has stage with few H-like ions few recombinations onto Helike weaker f+i line lower G=(i+f)/r ratio compared to CIE case • Example: 1E0102 supernova remnant (Rasmussen et al. 2001) 71 72
Dielectronic satellite lines Non-thermal electrons (Gabriel & Phillips 1979) • Example: spectrum in CIE • kT = 2 keV • Fe XXV He-like triplet: z (forbidden), x&y (intercombination), w (resonance) • Most other labelled lines Fe XXIV satellite lines • Lines @ E
Page 1 and 2: Introduction to spectroscopy Radiat
Page 3 and 4: Some common notation l l=0 l=1 l=2
Page 5 and 6: Collisional excitation Collisional
Page 7 and 8: • Photo-electric effect: photon k
Page 9 and 10: Ionisation equilibrium Collisional
Page 11: Non-thermal electrons (2 keV + 10%
Page 15 and 16: Results Fe XVII spectrum Capella (B
Page 17 and 18: • UTA = Unresolved Transition Arr
Page 19 and 20: Separate components in pressure equ
Page 21 and 22: Adding warm+hot gas, dust Oxygen co

X-ray spectroscopy (PDF) - SRON

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